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Closing a Smartline results in a closed area "Shape" if "Join Elements" is selected. When you to touch the startpoint after placing some vertexes - the fill options underneath the Toolsettings Dialog pop up.
As they appear you can not use the mouse to change the fill settings- they close immediately when the cursor is drawn away from the startpoint.
Using the "Arrows" (or "Tab" ) on your keyboard scrolls through the options in Toolsettings. Use "Enter" to select and the arrows to browse. You have to try around a bit for other options as they may require different handling.